Vanguard Long-Term Investment-Grade Fund Expense Example - Retail Prospectus [Member] - Vanguard Long-Term Investment-Grade Fund |
Jan. 31, 2026
USD ($)
|
|---|---|
| Investor Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 22 |
| Expense Example, with Redemption, 3 Years | 68 |
| Expense Example, with Redemption, 5 Years | 118 |
| Expense Example, with Redemption, 10 Years | 268 |
| Admiral Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 10 |
| Expense Example, with Redemption, 3 Years | 32 |
| Expense Example, with Redemption, 5 Years | 56 |
| Expense Example, with Redemption, 10 Years | $ 128 |